含海藻酸脲醛缓释复合肥中海藻酸含量的测定  

Determination of alginate content in urea formaldehyde slow-release compound fertilizer containing alginate

作　　者：任兴源 胥学辉 刘婉文 林成兵 刘洁容 莫晓雯 REN Xingyuan;XU Xuehui;LIU Wanwen;LIN Chengbing;LIU Jierong;MO Xiaowen(Summit Fertilizer(Foshan)Co.,Ltd.,Foshan 528143,China)

机构地区：[1]佛山住商肥料有限公司,广东佛山528143

出　　处：《磷肥与复肥》2024年第3期37-40,共4页Phosphate & Compound Fertilizer

摘　　要：分别使用咔唑比色法和间羟基联苯比色法测定含海藻酸脲醛缓释复合肥中海藻酸含量。采用咔唑比色法时脲醛氮会对显色体系造成严重干扰,使其偏离朗伯-比尔定律,导致结果偏大;采用间羟基联苯比色法时脲醛氮对显色体系无干扰,测定条件为四硼酸钠硫酸溶液用量5.00 mL、显色剂加入量100μL、显色时间10 min、测定波长525 nm,该方法的相对标准偏差为0.22%~0.25%,加标回收率为85.46%~103.64%,准确度高,精密性好。The carbazole method and m-hydroxybiphenyl method are used to determine the content of alginate in urea formaldehyde slow-release compound fertilizer containing alginate.With carbazole method,,urea formaldehyde nitrogen will cause serious interference to the color development system,making it deviate from Lambert-Beer law,leading to larger results;With the m-hydroxybiphenyl method,urea formaldehyde nitrogen has no interference to the color development system,the measurement conditions are sodium tetraborate sulfuric acid solution added amount of 5.00 mL,chromogenic agent added amount of 100μL,color development time of 10 minutes,and the measurement wavelength of 525 nm.The relative deviation of this method is 0.22%-0.25%,and the recovery rate is 85.46%-103.64%,the accuracy is high and the precision is good.

关 键 词：脲醛缓释复合肥 海藻酸 咔唑比色法 间羟基联苯比色法 

分 类 号：TQ440.72[化学工程—化学肥料工业] TQ444.9